p5- electricity in the home Flashcards by emily richardson | Brainscape

Q

what is direct current?

A

a current that flows in one direction

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Q

when is direct current used?

A

in batteries and solar cells

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Q

what is alternating current?

A

a current that constantly changes direction

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Q

when is alternating current used?

A

mains electricity

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Q

efficiency=

A

useful energy used / total energy supplied

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Q

what colour is the neutral wire?

A

blue

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Q

what voltage does the neutral wire have?

A

0 volts

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Q

what does the neutral wire do?

A

it completes the circuit

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Q

what colour is the live wire?

A

brown

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Q

what voltage does the live wire have?

A

(+ or -) 230 volts

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Q

what does the live wire carry?

A

potential difference

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Q

what colour is the earth wire?

A

green and yellow stripey

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Q

what voltage does the earth wire have?

A

0 volts unless faulty

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Q

what is the earth wire for?

A

safety

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Q

how do i find the frequency of the alternating current supply?

A

1 / time taken for one cycle

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Q

what are sockets and plugs surrounded in?

A

plastic

Q

why are sockets and plugs surrounded in plastic?

A

it’s a good insulator

Q

what does a domestic energy metre do?

A

measures energy supplied